Search found 1655 matches

by exxos
Tue Apr 17, 2018 8:25 am
Forum: PSU (power supplies)
Topic: TT/Mega STE power supply headaches
Replies: 25
Views: 205

Re: TT/Mega STE power supply headaches

Check you have 5V and 12V input to the 2 transistors ?
by exxos
Mon Apr 16, 2018 10:54 pm
Forum: PSU (power supplies)
Topic: TT/Mega STE power supply headaches
Replies: 25
Views: 205

Re: TT/Mega STE power supply headaches

I'll check the cap tomorrow... I hope I made mistake and installed wrong cap... That would finally allow me to enjoy my new TT... Also check you not put it in backwards... A guess also on values, is that is 10uF gives 2 seconds, then 100uF 20 seconds.. 200uF 40 seconds.. I meant on the "good" PSU d...
by exxos
Mon Apr 16, 2018 10:11 pm
Forum: PSU (power supplies)
Topic: TT/Mega STE power supply headaches
Replies: 25
Views: 205

Re: TT/Mega STE power supply headaches

It takes about 20-30 seconds and PG magically goes to 5v and... TT starts (and works) perfectly OK. So the big question is - what can cause such delay...? Does anybody know what generates "PG" ("power good") signal (on orange wire)? Is it PSU or TT? PG circulates around C23.. if you put 220uF inste...
by exxos
Mon Apr 16, 2018 8:08 pm
Forum: STFM
Topic: C103414 - STFM 4 x SMT DRAM
Replies: 7
Views: 82

C103414 - STFM 4 x SMT DRAM

ST_Motherboard_C103414-001_Rev_1_1_exxos.jpg
ST_Motherboard_C103414-001_Rev_1_1_exxos.jpg (153.27 KiB) Viewed 82 times

If anyone has a better image please add it!
by exxos
Mon Apr 16, 2018 7:20 pm
Forum: PSU (power supplies)
Topic: MSTE PSU RE-CAP FAIL
Replies: 3
Views: 370

Re: MSTE PSU RE-CAP FAIL

If you look closely on the other revision you'll see that track is not there (ie. exact same result as track cut on older revision). I suspect the track needs to be cut to prevent ground loop... I've only ever had that one power supply personally so I don't know about any other revisions.. I suspec...
by exxos
Mon Apr 16, 2018 6:25 pm
Forum: HARDWARE DISCUSSIONS
Topic: BLITTER RE-CREATION THOUGHTS
Replies: 22
Views: 848

Re: BLITTER RE-CREATION THOUGHTS

In light of been able to use the Suska blitter code I think trying to recreate the blitter on a gate level is probably a lot more time-consuming than just using the Suska code. Overall I assume the code is compatible but once the new PCB is done, I can program it with the blitter code and then we ca...
by exxos
Mon Apr 16, 2018 6:04 pm
Forum: HARDWARE DISCUSSIONS
Topic: Suska board
Replies: 35
Views: 1219

Re: Suska board

I just purchased the Suska III :shock: I think it will be useful for testing stuff out and ultimately making modifications as I will have a working platform to experiment with.. And probably screw it up totally :lol: 24-thickbox_default.jpg https://shop.inventronik.de/index.php?id_product=8&controll...
by exxos
Mon Apr 16, 2018 11:25 am
Forum: HARDWARE DISCUSSIONS
Topic: Suska board
Replies: 35
Views: 1219

Re: Suska board

I seem to remember running gembench but I used a real 68000 and sure I got around 99 or 100%. This was ages ago so maybe things have been updated, I took each core and wired them together as it is in the ST schematic s. It sounds like what I want to do, but I will start with blitter and throw every...
by exxos
Mon Apr 16, 2018 10:14 am
Forum: HARDWARE DISCUSSIONS
Topic: Suska board
Replies: 35
Views: 1219

Re: Suska board

.. and to put the CPU cycle accurate to rest.. Hi Chris, i think, that my 68K00 CPU (and also the other ones) are not Cycle by Cycle compatible. I have optimized a few things as you see for example the very slow division of the MC68000. Wolfgang and if the core could run faster... no, the implementa...
by exxos
Sun Apr 15, 2018 9:47 pm
Forum: RAM UPGRADES
Topic: 520 STFM 256kx4 DIL to 1Mx4 SOJ
Replies: 1
Views: 270

Re: 520 STFM 256kx4 DIL to 1Mx4 SOJ

Today's geek points go to Troed :thumbup: